Immobilization of zirconium amide on a Cp-modified silica surface and its use as a catalyst for ethylene polymerization
| Autor: | Tuula T. Pakkanen, Eero Iiskola, Sari Timonen |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Zirconium
Ethylene Chemistry Organic Chemistry chemistry.chemical_element Biochemistry Catalysis Inorganic Chemistry chemistry.chemical_compound Cyclopentadienyl complex Polymerization Ethylene polymerization Amide Polymer chemistry Materials Chemistry Methyllithium Physical and Theoretical Chemistry |
| Zdroj: | Journal of Organometallic Chemistry. 582:273-278 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/s0022-328x(99)00063-7 |
| Popis: | Heterogeneous ethylene polymerization catalysts were prepared by supporting tetrakis(dimethylamino)zirconium on chemically modified silica surface. The silica was modified with a silane coupling agent, Cp(CH 2 ) 3 Si(OEt) 3 , using ALCVD-technique. On the resulting cyclopentadienyl surface zirconium amide, Zr(NMe 2 ) 4 , was immobilized with and without using methyllithium. Depending on the use of methyllithium the immobilization resulted in either mono- or bis-cyclopentadienyl zirconium complexes, which were characterized using chemical analysis, FT-IR, 13 C- and 29 Si-NMR results. Moreover, a homogeneous model compound, (Me 3 SiCp) 2 Zr(NMe 2 ) 2 , was synthesized with a reaction between Zr(NMe 2 ) 4 and Me 3 SiCp. The preliminary results of ethylene polymerization with these supported and unsupported organometallic complexes are presented. |
| Databáze: | OpenAIRE |
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